1. Toothed whales can produce sounds using their larynx as well as specialized air sacs near their blowhole. If you were a scientist, what skill will you use when you listen to the sounds that are produced by whales? *
A. Interpreting data
B. Drawing conclusions
C. Making a hypothesis
D. Making observations
2. What is the correct order of the steps in the scientific method? *

A. Ask a question, analyze results, make a hypothesis, test the hypothesis, draw conclusions, communicate results.
B. Ask questions, make a hypothesis, test the hypothesis, analyze results, draw conclusions, communicate results.
C. Ask a question, make a hypothesis, test hypothesis, draw conclusions, analyze results, communicate results.
D. Make a hypothesis, test the hypothesis, analyze the results, ask a question, draw conclusions, communicate results.
3. Once the tennis ball was dropped, potential energy transformed into kinetic and once the ball bounced on the concrete surface the energy again transforms into elastic potential energy. Which of the following hypotheses is written correctly? *

A. If frozen tennis balls will not bounce as high.
B. If I heat up a tennis ball it will bounce high.
C. If I freeze a tennis ball, then it will not bounce as high.
D. If a tennis ball is frozen, it will not bounce as high as one that is not frozen
4. A scientist conducted an experiment to determine how the amount of salt in a body of water affects the number of plants that can live in the water. Which is the independent variable? *

A. Water
B. Temperature of the water
C. Amount of salt in the water
D. Number of plants in the water
5. A scientist conducted an experiment to determine how the amount of salt in a body of water affects the number of plants that can live in the water. In this experiment, which is the dependent variable? *

A. Water
B. Temperature of water
C. Amount of salt in the water
D. Number of plants in the water
6.Sabel grows the same bacteria in 20 petri dishes. She places 10 of the dishes in a container with a normal atmosphere. The remaining dishes she places in a container in which the oxygen level is double the normal level. She labels the first group "A" and the second group "B." Which statement best describes the groups? *

A. Group A is the hypothesis; Group B is the theory
B. Group A is the variable; Group B is the observation.
C. Group A is the experimental group; Group B is the control group.
D. Group A is the control group; Group B is the experimental group.
7. A botanist wants to see how different colored light waves influence the growth of pea plants. She puts the same number of seeds into three identical pots with the same kind and amount of soil. She then gives them the same amount of water every three days for the length of the experiment. One pot is placed into a dark windowless closet. Another pot is left on the windowsill, and the third is placed under a lamp with a green bulb. She records the height of each plant every day for three months. What is the independent variable in this experiment? *

A. the amount of soil in the pots
B. the color of the light given to the plants
C. the amount of water given to the plants
D. the amount of time the experiment was conducted
8. Methane is the simplest hydrocarbon, consisting of one carbon atom and four hydrogen atoms. Methane is a powerful greenhouse gas. How many atoms are present in methane molecule? *
A. one
B. two
C. three
D. four
9. Every morning Ayanna's mother make her milk for breakfast. Since Ayanna has sweet tooth, her mom always adds more sugar on her milk. A sugar is a good example of? *

A. Compound
B. Elements
C. Particles
D. Ingredients
10. Earth is called a living planet because it has water, good atmosphere, favorable climate conditions and suitable to for plants to live and animals too. It has gases that living organisms need for survival. What is the most abundant element found in the Earth atmosphere? *

A. Helium
B. Hydrogen
C. Nitrogen
D. Oxygen
11. As a pure substance, which of the following CANNOT be broken down into simple substance *

A. Chemical Formula
B. Compound
C. Element
D. Mixture
12.An element is any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Which of the following is NOT an example of element? *

A. Helium gas
B. Hydrogen
C. Ice
D. Iron
13. Which of the following statements is true about elements and compounds? *

A. Homogenous in nature
B. Simplest form of Matter
C. Commonly and naturally occurring materials.
D. Can be broken down into simpler substances.
14. Atoms are the basic units of matter and the defining structure of elements. Which of the following substance composed of one type of atom? *

A. Chemical Formula
B. Compound
C. Element
D. Mixture